Nov 21, 2012 12:00am PST
a helicopter which illuminating the hillside. they used a he can-seeking mechanism -- a heat seeking mechanism. >> they found a heat source on the side of the hill. we had our rescue team repel down the hill to look for where the chp stated they saw the heat source and we found nothing. we have the sheriff dive team out here. >> it was very slippery. some of his men started to slip down the hill. they were tethered. the dive team is going into the water and two members will look around. it is unknown at this point how long they will be in the water. this is something they are used to and it is an all volunteer team. the fact that it is raining out and it is dark means nothing. once they get underwater they will try to find this victim. this quarry is filled with water . in some areas it is estimated to be between 40 and 80 feet. there is no current. it is surrounded. dive teams from the alameda county sheriff's department will be going in shortly. unknown how long they will be in the water. john alston, abc news. >> thank you. rain is coming down now in oakland and across much of the bay area.